I currently use Zorin OS and I want to switch to Ubuntu. If I try UNetbootin for Linux, it doesn't show any boot entry to install Ubuntu and I can't purchase a USB flash drive right now.

How can I install Ubuntu without a USB flash drive or CD?

2 Answers 2


Booting Ubuntu ISO from Zorin GRUB Menu

The method on this page should also work for booting an Ubuntu ISO from the Zorin GRUB bootloader 20.04 booting .iso from GRUB menu No need for a USB here.

To reiterate:

  • Add the following menuentry to grub.cfg:

    menuentry "isoname ISO" {
      set root=(hdX,Y)
      set isofile="/[path]/[isoname].iso"
          loopback loop $isofile
          linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile toram --
          initrd (loop)/casper/initrd

Where (hdX,Y) is the disk and partition the ISO is on, [path] is the path to the folder the ISO file is in, and [isoname] is the name of the ISO

  • 1
    Maybe it is a good idea to use the boot option toram, if the user intends to overwrite the drive they boot from.
    – sudodus
    Jun 12, 2021 at 7:01
  • @sudodus: Yes of course. Jun 12, 2021 at 7:04

I understand the available drive? is not working, broken, showing up. If the assumption is that it's broken, try this first.

You could even use the USB you booted into the installer from BTW. And or a secondary HDD since Unetbootin allows for the use of HDDs.

Open GParted and format the drive, leave it as ext4. Uninstall Unetbootin sudo apt-get remove unetbootin. Install it again.

Hope you get around it! Cheers

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